Ledger USB Not Recognized | Cable Path, System Permission, and Screen Check
If Ledger USB is not recognized, the useful answer is to narrow the issue to cable path, system permission, app state, or screen state. Treat each layer as a check, not as a conclusion about the device.

Start with cable path and port choice
Check whether the cable supports data, whether the port is stable, and whether the device powers on. A fuller USB checklist is available in the USB connection guide.
Review the computer permission layer
System prompts, browser permission, and app access can all affect recognition. The broader computer setup context in the computer connection guide helps keep system permission separate from app state.
Compare app state with the hardware screen
Ledger Wallet may show one state while the hardware screen shows another. Use the USB environment check when the issue seems tied to port, cable, or permission order.
Write down the exact recognition point
The final note should say where recognition stopped: cable, port, system prompt, app page, or device screen. Do not add PINs or recovery phrase words to that note.